A heater for a lychee longan drying room

Abstract

The utility model provides a kind of heater of lychee longan drying room, its hearth rear end is connected with main flue, the rear end of main flue is connected with the vertically arranged rectangular rear flue, hearth upper end is equipped with the rectangular front flue corresponding with rear flue, the top surface of front flue or rear flue is equipped with smoke outlet, front flue is connected with rear flue between multiple layers of sub flue layer, each layer is equipped with multiple sub flues, the communication of sub flue and front, rear flue is formed by the barrier of horizontal partition plate in front flue and rear flue and ultimately is communicated with smoke outlet, and smoke outlet is connected with centrifugal fan;The utility model also has external temperature controller, and start-stop of centrifugal fan is controlled by temperature controller according to the detection temperature of drying chamber.The temperature control of the utility model for drying room drying chamber is more intelligent and accurate.The serpentine curved flue gas passage of the utility model as heat source transfers heat when heating the air of drying room heating chamber, and heat exchange is more sufficient and uniform.

Description

Technical Field

[0001] This utility model relates to a component of a fresh fruit drying equipment, specifically a heater for a lychee and longan drying room, belonging to the technical field of food processing equipment. Background Technology

[0002] Currently, lychee and longan drying is mostly done in small workshops. These traditional drying rooms typically use wood as fuel to save on heat costs. To avoid the dried fruit developing a smoky flavor, traditional drying rooms generally employ isolated hot air drying. This involves a furnace located in the lower center of the drying room, with the flue running horizontally back and forth once at the bottom before expelling upwards. Above this flue is a downward-blowing fan that blows heat from the flue's outer wall downwards, creating hot air that enters the drying chambers on either side of the drying room. This hot air dries the fruit placed in these chambers. Therefore, the hot air in the drying chambers of traditional drying rooms always circulates unidirectionally from bottom to top. This results in uneven heating of the fruit placed on the drying racks, leading to poor drying uniformity and affecting the consistency of the dried fruit's quality. Furthermore, traditional drying rooms have poor control over the combustion of wood fuel, requiring manual adjustment of the heat. This lack of intelligent and precise temperature control within the drying chambers makes it easy to scorch the fruit, affecting the quality of the dried fruit.

[0003] To address the aforementioned problems of traditional drying rooms, the applicant has developed a lychee and longan drying room with more rational hot air circulation and more intelligent and accurate temperature control of the drying chamber. The room includes main components such as the drying chamber body, heaters, and fan walls. A partition wall is centrally located at the front and back of the drying chamber body. Gaps for heater installation and passage are left between the partition wall and the inner wall of the drying chamber on both sides. Embedded heaters, with their front sides protruding outwards from the front side wall of the drying chamber body, are installed within the heater installation gaps. Two longitudinal fan walls are respectively located between the front and back side walls of the drying chamber body and the partition wall near the heaters, dividing the drying chamber body into a heating chamber and a drying chamber. During operation, the axial flow fans on the same fan wall rotate in the same direction, while the axial flow fans on the front and rear fan walls rotate in opposite directions. All the axial flow fans on the fan wall automatically switch directions once every set period of time. Therefore, the hot air in the drying room can achieve a timed alternating circulation of clockwise and counterclockwise flow under the obstruction of the partition wall, so that the fruit in the drying chamber is heated more evenly, thereby improving the drying uniformity and consistency of dried fruit quality.

[0004] The heater in this application is one of the main components of the lychee and longan drying room developed by the applicant. It adopts a front-to-back longitudinal layout to match the hot air circulation layout of the drying room. At the same time, it is equipped with a centrifugal fan at the exhaust outlet. The combustion temperature of the furnace is controlled by the centrifugal fan drawing air. It is also equipped with a temperature controller to control the start and stop of the centrifugal fan according to the detected temperature of the drying chamber. Therefore, the temperature of the drying chamber can be automatically maintained within a stable set range, and the phenomenon of scorching the fruit is not easy. Utility Model Content

[0005] The purpose of this invention is to provide a heater for a lychee and longan drying room, so as to construct a lychee and longan drying room with more reasonable hot air circulation and more intelligent and accurate temperature control of the drying chamber.

[0006] The specific technical solution adopted in this utility model is as follows:

[0007] A heater for a lychee and longan drying room includes a raised, supported furnace at its lower front end. The furnace has an opening with a door at its front end, and a longitudinally extending main flue connects to the rear end of the furnace. The rear end of the main flue connects to a vertically arranged rectangular rear flue. A rectangular front flue, corresponding to the rear flue, is fixedly mounted at the upper end of the furnace. The top surface of either the front or rear flue has a vertically extending exhaust outlet with a flange at its upper end. Multiple layers of horizontally and longitudinally spaced sub-flues connect the front and rear flues from bottom to top. Each sub-flue layer has multiple parallel, spaced sub-flues. The front and rear flues each contain sub-flues at two of these layers. A horizontal baffle is installed between the outlets, which blocks the flow of the sub-flue with the front and rear flues, forming a serpentine flue gas channel that flows from bottom to top and eventually connects to the exhaust outlet. The upper port of the exhaust outlet is connected to the inlet of the centrifugal fan via a flange, and the outlet of the centrifugal fan is connected to an external exhaust pipe for external discharge. This heater is also equipped with an external temperature controller. The temperature probe of the temperature controller is placed inside the drying chamber of the drying room to detect the temperature. The temperature control switch of the temperature controller is connected to the power supply line of the centrifugal fan, and the temperature controller controls the start and stop of the centrifugal fan according to the detected temperature in the drying chamber.

[0008] The heater in this lychee and longan drying room adopts a longitudinal layout, which is easy to match with the hot air circulation layout of the drying room. Because the heater is equipped with a centrifugal fan at the exhaust outlet and a temperature controller that controls the fan's start and stop based on the detected temperature in the drying chamber, as long as there is sufficient wood fuel in the furnace, the combustion temperature in the furnace can be adjusted by controlling the centrifugal fan's operation. This allows the temperature of the drying chamber to be automatically maintained within a stable set range. Therefore, using this heater provides more intelligent and accurate temperature control in the drying chamber, reducing the risk of scorching the fruit. The heater uses horizontal baffles to create a serpentine flue gas channel that connects the sub-flue with the front and rear flues, ultimately connecting to the exhaust outlet. This serpentine flue gas channel, acting as a heat source, transfers heat to the air in the drying chamber more thoroughly and evenly. Attached Figure Description

[0009] Figure 1 This is a three-dimensional structural diagram of the heater.

[0010] Figure 2 for Figure 1 A three-dimensional structural diagram of the heater when it is rotated to the right side facing forward.

[0011] Figure 3 for Figure 2 Exploded view of the heater components.

[0012] Figure 4 for Figure 2 A three-dimensional structural diagram of the heater after removing the centrifugal fan and external exhaust duct.

[0013] Figure 5 for Figure 4 A three-dimensional sectional view of the heater after horizontal and vertical cutting.

[0014] Figure 6 This is a three-dimensional structural diagram of a lychee and longan drying room constructed using this heater.

[0015] Figure 7 for Figure 6 A three-dimensional structural diagram of the drying room after removing the top panel and drying racks inside the drying chamber.

[0016] In the diagram: 1-furnace, 1.1-furnace opening, 2-main flue, 3-rear flue, 4-front flue, 4.1-insulation door, 5-exhaust outlet, 6-sub-flue, 7-horizontal baffle, 8-centrifugal fan, 9-external exhaust pipe, 10-temperature controller, 10.1-temperature probe, 11-vertical baffle. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments and accompanying drawings. In the description of the present invention, the directional terms "upper," "lower," "front," "rear," "left," and "right" are based on the accompanying drawings. Figure 1 , Figure 6 , Figure 7 The orientations or positional relationships shown are defined only for the convenience of describing this utility model, and do not refer to a specific orientation that the device or component must have, and should not be regarded as a limitation of this utility model.

[0018] like Figures 1-5 As shown, the lower front end of this heater is provided with a furnace chamber 1 supported by a raised frame. The front end of the furnace chamber 1 is provided with a furnace opening 1.1 with a furnace door. The rear end of the furnace chamber 1 is connected to a longitudinally extending main flue 2. The rear end of the main flue 2 is connected to a vertically arranged rectangular rear flue 3. The upper end of the furnace chamber 1 is fixedly supported with a rectangular front flue 4 corresponding to the rear flue 3. The top surface of the front flue 4 or the rear flue 3 is provided with a vertically extending exhaust outlet 5 with a flange at the upper end. The front flue 4 and the rear flue 3 are connected from bottom to top by multiple layers of horizontally and longitudinally spaced sub-flue layers. Each sub-flue layer is provided with multiple parallel and spaced sub-flues 6. The front flue 4 and the rear flue 3 are respectively located between the ports of two layers of sub-flues 6. A horizontal baffle 7 is provided, which blocks the connection between the sub-flue 6 and the front and rear flues 4 and 3 to form a serpentine flue gas channel from bottom to top and finally connects to the exhaust outlet 5. The upper port of the exhaust outlet 5 is connected to the air inlet of the centrifugal fan 8 through a flange. The air outlet of the centrifugal fan 8 is connected to an external exhaust pipe 9 for external discharge. This heater is also equipped with an external temperature controller 10. The temperature probe 10.1 of the temperature controller 10 is placed in the drying chamber of the drying room to detect the temperature. The temperature control switch of the temperature controller 10 is connected to the power supply line of the centrifugal fan 8. The temperature controller 10 controls the start and stop of the centrifugal fan 8 according to the detected temperature of the drying chamber.

[0019] Furthermore, a vertical partition 11, with its lower end touching the ground, is centrally located on the outer side of the main flue 2 and the sub-flue 6, supporting the middle of the main flue 2 and the sub-flue 6 from bottom to top. Simultaneously, the vertical partition 11 divides the perimeter of the main flue 2 and the sub-flue 6 into two air heating zones. This division into two air heating zones better complements the design of the drying chamber's partition walls and the two fan walls, achieving a better hot air circulation effect within the drying chamber and resulting in superior drying performance.

[0020] Furthermore, the front side of the front flue 4 is provided with an outwardly opening door 4.1 to facilitate ash cleaning and maintenance.

[0021] Furthermore, the horizontal partition 7 of the front flue 4 is a welded fixed partition.

[0022] Furthermore, the horizontal partition 7 of the rear flue 3 shown is an outwardly removable insert-type movable partition. The side wall of the rear flue is provided with insertion holes at corresponding positions. The end of the movable partition is connected to a fixing plate. After the movable partition is inserted into the insertion hole, the fixing plate is fixedly connected to the side wall of the rear flue by screws, thereby sealing the insertion hole.

[0023] Furthermore, each sub-flue layer is provided with four parallel and spaced sub-flues 6. The sub-flues 6 adopt a rectangular cross-section to increase the surface area of ​​the outer side of the sub-flues 6 and improve the efficiency of external heat exchange.

[0024] Furthermore, such as Figure 5 As shown, the sub-flue layer has a total of 9 layers. The horizontal baffle 7 of the rear flue 3 is located between the ports of the 3rd and 4th sub-flue 6 from bottom to top. The horizontal baffle 7 of the front flue 4 is located between the ports of the 6th and 7th sub-flue 6 from bottom to top. The exhaust outlet 8 is located on the top surface of the front flue 4. In use, the hot flue gas from the combustion in the furnace 1 enters from the main flue 2 below the horizontal baffle 7 of the rear flue 3, then enters from the sub-flue 6 of layers 1-3 below the horizontal baffle 7 of the front flue 4, then enters from the sub-flue 6 of layers 4-6 above the horizontal baffle 7 of the rear flue 3, then enters from the sub-flue 6 of layers 7-9 above the horizontal baffle 7 of the front flue 4 and is discharged from the exhaust outlet 8 on the top surface of the front flue 7.

[0025] like Figures 6-7 As shown, this heater is installed in the heater installation gap of the lychee and longan drying room. The front side of the heater's front flue 4 and the furnace opening 1.1 of the furnace 1 protrude outward from the corresponding openings on the front side wall of the room. The heater's exhaust outlet 5 extends outward from inside the drying room through the top plate of the room. The heater's centrifugal fan 8 and external exhaust pipe 9 are mounted on the outside of the top plate of the drying room. When this heater is working, wood fuel is placed in the furnace 1 of the heater for combustion. The hot flue gas from the combustion passes through the serpentine flue gas channel and transfers heat to the air in the heating chamber of the drying room. Then, the axial flow fans on the front and rear fan walls, which turn in opposite directions, drive the hot air in the heating chamber to form a hot air circulation along the room and blow it into the drying chamber to dry the fruit on the drying rack. As long as there is sufficient wood fuel in the furnace 1, the temperature controller 10 can control the start and stop of the centrifugal fan 8 according to the detected temperature of the drying rack chamber, thereby adjusting the combustion temperature of the furnace 1 and automatically maintaining the temperature of the drying chamber within a stable set range, making it less likely for the fruit to be scorched.

[0026] The above illustrations are merely typical embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A heater for a lychee and longan drying room, characterized in that: The lower front end of the heater is provided with a furnace chamber (1) supported by a raised frame. The front end of the furnace chamber (1) is provided with a furnace opening (1.1) with a furnace door. The rear end of the furnace chamber (1) is connected to a longitudinally extending main flue (2). The rear end of the main flue (2) is connected to a vertically arranged rectangular rear flue (3). The upper end of the furnace chamber (1) is fixedly supported with a rectangular front flue (4) corresponding to the front and rear of the rear flue (3). The top surface of the front flue (4) or the rear flue (3) is provided with a vertically extending exhaust outlet (5) with a flange at the upper end. The front flue (4) and the rear flue (3) are connected from bottom to top by multiple layers of horizontally and longitudinally spaced sub-flue layers. Each sub-flue layer is provided with multiple parallel and spaced sub-flues (6). The front flue (4) and the rear flue (3) are respectively located between the ports of two layers of sub-flues (6). A horizontal partition (7) is provided at the position. The horizontal partition (7) blocks the connection between the sub-flue (6) and the front and rear flues (3) to form a serpentine flue gas channel from bottom to top and finally connects to the exhaust outlet (5). The upper port of the exhaust outlet (5) is connected to the air inlet of the centrifugal fan (8) through a flange. The air outlet of the centrifugal fan (8) is connected to an external exhaust pipe (9) for external discharge. This heater is also equipped with an external temperature controller (10). The temperature probe (10.1) of the temperature controller (10) is placed in the drying chamber of the drying room to detect the temperature. The temperature control switch of the temperature controller (10) is connected to the power supply line of the centrifugal fan (8). The temperature controller (10) controls the start and stop of the centrifugal fan (8) according to the detected temperature of the drying chamber.

2. The heater in the lychee and longan drying room according to claim 1, characterized in that: The heater is positioned at the center of the front and rear sides of the main flue (2) and the sub-flue (6), with a vertical partition (11) on the ground at the bottom. The partition (11) supports the middle of the main flue (2) and the middle of the sub-flue (6) from bottom to top. At the same time, the vertical partition (11) divides the outer perimeter of the main flue (2) and the sub-flue (6) into two air heating zones.

3. The heater in the lychee and longan drying room according to claim 1, characterized in that: The front side of the front flue (4) is provided with an outwardly opening door (4.1).

4. The heater in the lychee and longan drying room according to claim 1, characterized in that: The horizontal partition (7) of the front flue (4) is a welded fixed partition.

5. The heater in the lychee and longan drying room according to claim 1, characterized in that: The horizontal partition (7) of the rear flue (3) is a movable partition that can be pulled outward. The side wall of the rear flue (3) is provided with a hole at the corresponding position. The end of the movable partition is connected to a fixing plate. After the movable partition is inserted into the hole, the fixing plate is fixedly connected to the side wall of the rear flue (3) by screws, thereby sealing the hole.

6. The heater in the lychee and longan drying room according to claim 1, characterized in that: Each sub-flue layer is provided with 4 parallel and spaced sub-flues (6), and the sub-flues (6) adopt a cross-section of rectangular flue.

7. The heater in the lychee and longan drying room according to claim 1, characterized in that: The sub-flue layer has a total of 9 layers. The horizontal partition (7) of the rear flue (3) is located between the ports of the 3rd and 4th sub-flue (6) from bottom to top. The horizontal partition (7) of the front flue (4) is located between the ports of the 6th and 7th sub-flue (6) from bottom to top. The exhaust outlet (5) is located on the top surface of the front flue (4).

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